5.2. Accessibility

Some users may need specific support because of e.g. some visual
impairment.
Most
accessibility features have to be enabled manually.
Some boot parameters can be appended to
enable accessibility features.
Note that on most architectures the boot loader interprets your keyboard as
a QWERTY keyboard.

5.2.1. Board Devices

Some accessibility devices are actual boards that are plugged inside the
machine and that read text directly from the video memory. To get them
to work framebuffer support must be disabled by using the
fb=false
boot parameter. This will however reduce the number of available languages.

5.2.2. High-Contrast Theme

For users with low vision, the installer can use a high-contrast
theme that makes it more readable. To enable it, append the
theme=dark boot parameter.